/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer. 
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution. 
 * 3.  Neither the name of Google, Inc. ("Google") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY GOOGLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#include "config.h"
#include "Crypto.h"

#include "ExceptionCode.h"
#include <wtf/ArrayBufferView.h>
#include <wtf/CryptographicallyRandomNumber.h>

namespace WebCore {

namespace {

bool isIntegerArray(ArrayBufferView* array)
{
    ArrayBufferView::ViewType type = array->getType();
    return type == ArrayBufferView::TypeInt8
           || type == ArrayBufferView::TypeUint8
           || type == ArrayBufferView::TypeUint8Clamped
           || type == ArrayBufferView::TypeInt16
           || type == ArrayBufferView::TypeUint16
           || type == ArrayBufferView::TypeInt32
           || type == ArrayBufferView::TypeUint32;
}

}

Crypto::Crypto()
{
}

void Crypto::getRandomValues(ArrayBufferView* array, ExceptionCode& ec)
{
#if USE(OS_RANDOMNESS)
    if (!array || !isIntegerArray(array)) {
        ec = TYPE_MISMATCH_ERR;
        return;
    }
    if (array->byteLength() > 65536) {
        ec = QUOTA_EXCEEDED_ERR;
        return;
    }
    cryptographicallyRandomValues(array->baseAddress(), array->byteLength());
#else
    ASSERT_UNUSED(array, array);
    ec = NOT_SUPPORTED_ERR;
#endif
}

}
